What is the manual alarm, and the principle of hand alarm?
Hand alarm device small size, light weight, easy to carry, easy to install. Do not need any tools. Only 0.15 square face and people standing on the place can be normal operation, and liquidity is very strong.
The hand alarm eliminates the need for power and can provide an effective alarm in all locations where power is not available. Only through the manual hand clockwise shaking the handle, the speed to the primary (50-80 r / min) can achieve the desired alarm effect, the sound of sharp, shocking, strong penetration. The alarm sound size depends on the speed at which the handle is shaking. The new hand alarm sets the shutter shutter mechanism in the tone window, which quickly closes the sound window, blocks the sound, and generates a different signal. (Old product does not have this feature!)
Hand alarm according to style sub-portable, fixed, three kinds of lifting, are used in different places of the incident early warning alarm equipment, the size of the user to see the intensity and speed of the manual, the sound size can be adjusted at any time, Automatically turn off the sound and so on.
